Article
Energy & Fuels
Jin-Lin Mei, Yu Shi, Cheng-Kun Xiao, Ao-Cheng Wang, Ai-Jun Duan, Xi-Long Wang
Summary: Hierarchically porous Beta/SBA-16 (BS) composite materials were synthesized through a two-step in-situ assembly hydrothermal crystallization method, and NiMo catalysts supported on BS with different silica-alumina ratios were prepared. The catalysts exhibited high hydrodesulfurization activity due to the synergistic effects of various factors.
Article
Chemistry, Physical
Ke Yu, Weimin Kong, Zhen Zhao, Aijun Duan, Lian Kong, Xilong Wang
Summary: Mesoporous yolk-shell silica spheres with different shell thicknesses and yolk sizes were synthesized and used as catalyst supports for hydrodesulfurization reactions. The results showed that the shell thickness and yolk size significantly affect the catalytic activity, with the NiMo/Al-Y30S13 catalyst exhibiting the highest activity. Additionally, the mechanisms of DBT and 4,6-DMDBT HDS over NiMo/Al-YxSy materials were proposed.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Applied
Teddy Roy, Julie Rousseau, Antoine Daudin, Gerhard Pirngruber, Benedicte Lebeau, Jean-Luc Blin, Sylvette Brunet
Summary: Mesostructured titania as a support for the CoMoS active phase enhances HDS activity and DDS selectivity, with temperature treatment significantly affecting catalyst activity. Higher activities are obtained after treatment at 380 degrees C, correlating with higher specific surface area and a semicrystalline anatase framework in the mesostructured TiO2 material.
Article
Energy & Fuels
Cheng-Kun Xiao, Yu-Tong Zou, Dong-Ze Li, En-Hua Wang, Ao-Cheng Wang, Dao-Wei Gao, Ai-Jun Duan, Peng Zheng, Xi-Long Wang
Summary: A novel composite material TD composed of TS-1 microcrystalline and DMSNs was prepared, which had an open pore structure and large specific surface area. TD-70 exhibited the best desulfurization activity due to its large open pore structure, good acidity, and perfect dispersion of metallic active sites.
Article
Chemistry, Physical
J. A. Medina Cervantes, J. N. Diaz de Leon, S. Fuentes Moyado, G. Alonso-Nunez
Summary: This study investigated the influence of different precursor compounds and the addition of nickel on the structural and catalytic properties of CoNiMo catalysts supported on SBA-15. The results showed that the type of precursor compound used and the amount of nickel added had a significant impact on the HDS activity of the catalysts.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yin-Hua Zhu, Jian-Bo Yang, Xiao-Mei Liu, Ji-Lei Wang, Qing-Dong Ping, Ze-Yu Du, Jia-Nian Li, Ting-Ting Zang, Hua Mei, Yan Xu
Summary: This study successfully synthesized two novel zinc-capped polyoxo-metalate-based organic-inorganic hybrids with high catalytic properties for sulfur oxidation and carbon dioxide cycloaddition reactions.
DALTON TRANSACTIONS
(2022)
Article
Energy & Fuels
Rupesh Singh, Deepak Kunzru, Sri Sivakumar
Summary: The research demonstrates that NiMoW trimetallic catalysts exhibit higher activity in hydrodesulfurization due to synergistic effect, which involves partial substitution of Mo by W during synthesis, as well as the use of ultrasmall size catalysts.
Article
Engineering, Chemical
Bo Wang, Zhentao Chen, Tao Jiang, Jiahuan Yu, Haoxuan Yang, Aijun Duan, Chunming Xu
Summary: This study synthesized a macromolecular organosulfur compound 2,8-DPPDBT and prepared three NiMo-supported SBA-15 catalysts with different pore sizes. The diffusion behaviors of the compound in the catalysts were investigated, and a correlation between effective diffusivity and the molecule-to-pore size ratio was proposed. This empirical correlation provides theoretical guidance for the design of efficient heavy oil hydrodesulfurization catalysts.
Article
Chemistry, Inorganic & Nuclear
Islam Ali, Tawfik A. Saleh
Summary: The influence of boron element on the activity of a hydrodesulfurization catalyst was evaluated. The addition of boron improved the specific surface area and catalytic activity of the catalyst, highlighting the significant role of boron in enhancing catalyst performance.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jesus Miguel Ramos, Jin An Wang, Sergio Odin Flores, Lifang Chen, Ulises Arellano, Luis Enrique Norena, Julio Gonzalez, Juan Navarrete
Summary: This study reports the ultrasound-assisted hydrothermal synthesis of V2O5 dispersed on SBA-15 and Zr doped SBA-15 catalysts for DBT oxidation reaction. It found that Lewis acidity significantly affects DBT conversion and proposed two pathways for DBT oxidation reaction.
Article
Chemistry, Multidisciplinary
Saheed A. Ganiyu
Summary: The research explores the synergistic effect of boron and cobalt in CoMoS supported on B2O3-SBA-15 for ultradeep hydrodesulfurization. The catalysts BSM and BSMC outperformed their analogous catalysts SM and SMC, exhibiting outstanding catalytic efficiency in desulfurizing diesel fuel. The BSMC catalyst showed a favorable and lower activation energy, making it a potential commercial catalyst for ultradeep desulfurization of real fuel.
RESEARCH ON CHEMICAL INTERMEDIATES
(2021)
Article
Chemistry, Multidisciplinary
Xiantao Niu, Weixia Zhou, Yuanyuan Han, Yongjun Liu
Summary: In this study, CoMoS catalysts with controllable morphology were prepared using a single-source hydrothermal method. The coordination between the metal atom and DDTC was found to effectively control the crystal growth of MoS2 and promote the formation of the active phase. Catalysts with fewer stacking layers of MoS2 slabs showed increased conversion efficiency for HDS activity.
Article
Chemistry, Physical
Guan Huang, Zhichao Sun, Zhiquan Yu, Ying-Ya Liu, Yao Wang, Wei Wang, Anjie Wang, Yongkang Hu
Summary: Highly dispersed Ni2P catalysts were prepared from nickel phyllosilicate precursor by the deposition-precipitation method. Si-containing materials were used as supports, and the strong interaction between Ni and Si species effectively prevented aggregation. The resulting Ni2P catalyst showed higher hydrogenation activity due to the strong metal-support interaction, smaller particle size, and higher degree of coordinately unsaturated sites.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Applied
Di Zhang, Xin-Mei Liu, Yu-Xiang Liu, Zi-Feng Yan
Summary: The pore structure significantly influences the performance of Ni-Mo/γ-Al2O3 catalyst and the desulfurization pathway of 4,6-dimethyldibenzothiophene. By adjusting the pore size, the reducibility of Mo species and the Ni-Mo-S structure can be modified, resulting in different reaction pathways and efficiencies. The design of deep desulfurization catalysts for environmental protection can be optimized based on these findings.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Peter J. Topalian, Bo A. Carrillo, Paul M. Cochran, Michael F. Takemura, Mark E. Bussell
Summary: A series of Ni2-xRuxP/SiO2 catalysts were prepared spanning the full composition space, with Ru playing a key role in lowering the precursor reduction temperature and increasing the P content in the supported Ni2-xRuxP phase. Catalysts with higher Ru content exhibited significantly enhanced HDS activity and selectivity.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Applied
H. Vargas-Villagran, M. A. Flores-Villeda, I. Puente-Lee, D. A. Solis-Casados, A. Gomez-Cortes, G. Diaz-Guerrero, T. E. Klimova
Article
Chemistry, Applied
D. A. Solis-Casados, C. E. Rodriguez-Nava, T. Klimova, L. Escobar-Alarcon
Article
Chemistry, Applied
H. Vargas-Villagran, D. Ramirez-Suarez, G. Ramirez-Munoz, L. A. Calzada, G. Gonzalez-Garcia, T. E. Klimova
Summary: The hydrogenation of naphthalene using nickel catalysts on SBA-15 and Al-SBA-15 supports was studied to evaluate the effect of support acidity. Catalysts prepared with Al-SBA-15 support and Ni:EDTA complex showed higher activity and selectivity towards decalins. This was attributed to better dispersion of metallic Ni species and higher total amount of acid sites.
Article
Engineering, Environmental
Omar Hernandez-Rivas, Ana Martinez, Heriberto Pfeiffer, J. Arturo Mendoza-Nieto
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Applied
Luis Jorge Rodriguez Castillo, Luis Escobar Alarcon, Tatiana E. Klimova
TOPICS IN CATALYSIS
(2020)
Article
Engineering, Environmental
Hector Martinez-Hernandez, J. Arturo Mendoza-Nieto, Heriberto Pfeiffer, Jose Ortiz-Landeros, Lucia Tellez-Jurado
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Multidisciplinary
J. Arturo Mendoza-Nieto, Hector Martinez-Hernandez, Heriberto Pfeiffer, J. Francisco Gomez-Garcia
Summary: This work presents a kinetic study of CO2 capture on Na2ZrO3 as a function of temperature and CO2 flow rate. A new kinetic model is proposed and discussed, which considers the formation of a Na2CO3-ZrO2 layer and the enhancement of the capture process by Na+ ions diffusion. The results show that the CO2 capture efficiency is improved as the CO2 flow rate increases. The activated state energy for surface capture and bulk capture are calculated using the Eyring model. The study also discusses the impact of CO2 sorption desorption process at low temperature and flow rate on high-temperature CO2 capture.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Nanoscience & Nanotechnology
Lucy-Caterine Daza-Gomez, Victor-Fabian Ruiz-Ruiz, J. Arturo Mendoza-Nieto, Heriberto Pfeiffer, Geonel Rodriguez Gattorno, David Diaz
Summary: The catalytic activity of pristine Co3O4 and Co3O4-halloysite nanotubes composite towards dry methane reforming was analyzed. Results showed that both materials have bifunctional catalytic behavior and the Co3O4-halloysite nanotubes composite exhibited the highest H2 production under specific conditions.
APPLIED NANOSCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Lina A. Calzada, Daniel Perez-Estrada, Miriam Sanchez-Ramirez, Diana Gomora-Herrera, Antonio Gomez-Cortes, Gabriela Diaz, Tatiana E. Klimova
Summary: The influence of acid sites on the hydrodeoxygenation of anisole over Ni catalysts supported on modified SBA-15 was investigated. The modification of SBA-15 with metal oxides increased the metal-support interaction and acidity of the catalysts, leading to improved selectivity to cyclohexane. The increase in the amount and strength of acid sites, especially Brønsted sites, promoted the cleavage of the C-O bond.
Article
Chemistry, Physical
Elim Albiter, Jose M. Barrera-Andrade, Lina A. Calzada, Jesus Garcia-Valdes, Miguel A. Valenzuela, Elizabeth Rojas-Garcia
Summary: In this study, reduced graphene oxide-TiO2 composites were prepared by synthesizing graphene oxide and in situ photoreduction. The composites exhibited higher photocatalytic activity than TiO2, which can be attributed to the chemical interaction between graphene oxide and TiO2, leading to faster electron transfer and lower charge recombination rates.
Article
Chemistry, Multidisciplinary
Susana Hernandez-Castillo, Hector Martinez-Hernandez, J. Arturo Mendoza-Nieto
Summary: The addition of alkali carbonates to lithium cuprate improves both CO conversion and CO2 chemisorption at moderate temperatures, promoting CO oxidation and CO2 capture by forming a new phase. Samples modified with a single carbonate, either Na or K, show a higher tendency to capture CO2 formed during CO oxidation, allowing the simultaneous elimination of CO and CO2. This modified Li2CuO2 material has the potential to replace two different materials typically used in industrial processes.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.